Sequence of Late Jurassic–Early Cretaceous magmatic–hydrothermal events in the Xiong'ershan region, Central China: an overview with new zircon U–Pb geochronology data on quartz porphyries

Deng, Jun, Gong, Qingjie, Wang, Changming, Carranza, Emmanuel John M., and Santosh, M. (2014) Sequence of Late Jurassic–Early Cretaceous magmatic–hydrothermal events in the Xiong'ershan region, Central China: an overview with new zircon U–Pb geochronology data on quartz porphyries. Journal of Asian Earth Sciences, 79 (Part A). pp. 161-172.

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Abstract

Recent investigations have revealed several large Au and Mo deposits in the Xiong’ershan region, Central China. Most quartz porphyries associated with the mineralization occur as dikes and apophyses, or as rubbles cemented in mineralized breccia pipes. Three types of quartz porphyries were sampled from the Leimengou Mo deposit, the Qiyugou Au deposit, and the Niutougou Au deposit. LA–ICP–MS zircon U–Pb analysis was performed in zircons from two quartz porphyries; the results yielded ages of 125.4 ± 0.77 Ma for Leimengou Mo deposit and 150.1 ± 1.1 Ma for Qiyugou Au deposit. The magma source of Leimengou quartz porphyry is similar to that of the mineralized cementing material in breccia pipes of the Qiyugou Au deposit, whereas the magma source of Qiyugou quartz porphyry is the same as that of quartz porphyries in Niutougou Au deposit. Based on the new U–Pb isotopic ages of granitic plutons reported in this study, together with the age data in the literature, we identify distinct magmatic pulses in the Xiong'ershan region at ca.160, 150, 143, 133, 125, and 115 Ma during the Late Jurassic–Early Cretaceous. The ages of Au and Mo mineralization coincide with the thermal events at about 115, 125, 133, and 143 Ma are considered to be co-eval with granitic magmatism. No mineralization ages of 150 and 160 Ma thermal events have been previously reported. Our study demonstrates Late Jurassic–Early Cretaceous multiple magmatic pulses and mineralization in the Xiong'ershan region.

Item ID: 31076
Item Type: Article (Research - C1)
ISSN: 1878-5786
Keywords: zircon U–Pb geochronology; Au–Mo deposits; quartz porphyry; magmatic–hydrothermal events; Central China
Funders: Natural Science Foundation of China, Project of China Gold Group
Projects and Grants: Natural Science Foundation of China Grant No. 41230311, Project of China Gold Group GPR2008-03
Date Deposited: 17 Jun 2014 02:40
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040303 Geochronology @ 40%
04 EARTH SCIENCES > 0403 Geology > 040307 Ore Deposit Petrology @ 40%
04 EARTH SCIENCES > 0402 Geochemistry > 040202 Inorganic Geochemistry @ 20%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 60%
84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840199 Mineral Exploration not elsewhere classified @ 40%
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